Discharge control for paving machines



March 16, 1937. c. H. WAGNER DISCHARGE CONTROL FOR PAVING MACHINES Filed April 16, 1931 4 Sheets-Sheet l Mai'ch 16, 1937. c. H. WAGNER 2,073,770

DISCHARGE CONTROL FOR PAVING MACHINES Filed April 16, 1951 4 Shee ts-Sheet 2 ATCHHETER.

p a I =1 Cuba/M4116 gwwntoz I o illilPl Z lllllll 1||| |L|| l/il lallllill I! i 4 Sheets-Sheet 3 BATCHMET E R.

C. H. WAGNER Filed April 16, 1931 March 16, 193 7.

' DISCHARGE CONTROL FOR PAVING MACHINES March 16, 1937. H, WAGNER 2,073,770

DISCHARGE CONTROL FOR PAVING MACHINES Filed April 16, 1931 4 Sheets-Sheet 4 3H uenfez Patented Mar. 16, 1937 UNITED STATES PATENT OFFICE DISCHARGE CONTROL FOR PAVING MACHINES 18 Claims.

This invention relates to machines commonly known today as concrete paving machines of the boom and bucket type. These machines com prise primarily a concrete mixer having an at- 5 tachment associated therewith in the form of a boom equippedwith a bucket for distributing the concrete, this bucket being arranged for movement along the boom and adapted to be discharged at asuitable time during this movement. In the modern pavers, there is a tendency to speed up the operation of'mixing and discharging by utilizing eertainautomatically operated mechanisms whereby after the materials have been mixed within the mixing drum, they are caused 15 to be automatically discharged therefrom, which,

of course, must make it necessary that the operator return the discharge bucket to a position under the discharge chute at or before this discharging action of the mixing drum takes place. 20 Otherwise the mixed material will be discharged onto the ground, thus delaying rather than speeding up the output of the machine.

An example of this automatic paving machine is disclosed in the patent to John F. Robb, No.

25 1,660,301, while examples of the mechanisms for causing the discharge chute to be automatically turned to discharging position at the end of the mixing period are disclosed in the patents to E. L. Tranaas, 1,824,580, A. C. Menningen, No.

30 1,648,144, E. H. Lichtenberg, 1,532,249, and John F. Robb, No. 1,370,497. In these patents a batchmeter is provided for causing the automatic functioning of the discharge chute at the end of the mixing period, this batchmeter being disclosed in 35 detail in the patent to H. O. Winkler, No.

Of course, even in the machines wherein the discharge at the end of the mixing period is not automatic and a power mechanism is provided to turn the discharge chute to discharging position, such as disclosed in the patent to A. C. Menningen, No. 1,648,144, the operator sometimes absentmindedly or inadvertently trips the power discharge mechanism at the end of the mixing period when he hears the batchmeter signal, and even under these conditions, the concrete will be spilled onto the ground if the bucket is not under the discharge chute at this time.

In order to speed up production, some of the more modern pavers have been constructed with two mixing drums, such as disclosed in the pat ent to E. H. MclVIi1lan,No. 1,619,145. In this type of machine the material is first introduced and mixed in one drum for a period of time, approx- 5 imately one-half of the customary period, that is to say, one-half minute. It is then transferred to the second or tandem drum andthere mixed for a second corresponding period and then discharged. From the above it will be observed that while the total mixing period remains 5 the same as the single drum machines, the individual drums discharge in one-half the time. or in other words, the production of these tandem machines speeds up the discharge to approximately half the time required in the single drum 10 type. By utilizing an automatic discharge mechanism on these tandem mixers, it is quite probable that unless some type of control is added to prevent the discharge chute from being turned to discharging position when the bucket is not under the chute, the operator would not return the bucket in time and the result would be that the discharge chute would be turned to its discharging position at the wrong time and, therefore, the contents of the drum would be spilled onto the ground.

Furthermore, in all of these machines, if the bucket is moved away from its receiving position while the mixing drum is discharging therein, the same result would occur, namely, the spilling of the rest of the batch onto the ground.

An object of my invention is, therefore, to do away entirely with any possibility of an accidental discharge of the material onto the subgrade or ground, either by reason of the bucket not being returned to its receiving position in time or by the operator inadvertently moving the bucket away from the discharge chute while the drum is discharging.

A further object is to control the discharging action of the mixer by the distributing bucket or carriage so that under certain conditions it will cause the discharge chute to be turned to discharging position as an incident to the return of the bucket and carriage to their receiving position.

Another object of my invention is to control the charging action of a mixer of the automatic type by the distributing bucket or carriage.

A still further object is to completely contro the operation of an automatic type of concrete paving machine by the distributing bucket.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In the drawings:-

Fig. l is a somewhat diagrammatic view in side elevation of a modern automatic paving machine mately on the line 8-8 of the single drum type and showing my invention applied thereto;

Fig. 2 is an enlarged fragmentary view of a portion of the machine disclosed in Fig. 1 and showing my invention more clearly, the full lines showing the control mechanism in its released position and the dotted lines disclosing the control mechanism in its controlling position;

Fig. 3 is a horizontal sectional view on the line 3-3 of Fig. 2, certain parts omitted therefrom for the sake of clearness;

Fig. 4 is a view similar to Fig. 2, disclosing a slightly modified form of my invention, wherein the discharge chute is returned to mixing position incident to the return of the carriage to receiving position;

Fig. 5 is a fragmentary detail View of certain of the parts as shown in Fig. 4, the full lines representing the association of the parts when the power discharge is actuated to turn the chute to mixing position incident to movement of the carriage away from the inner end of the boom, and the dotted lines showing the parts in locked or controlling position when the carriage and bucket are away from the inner end of the boom;

Fig. 6 is a detail sectional view of the latch for preventing the tripping of the power discharge mechanism by the batchmeter at the end of the mixing period when the bucket is out on the boom away from its receiving position;

Fig. 7 is a sectional view through a power unit for operating the discharge chute; and

Fig. 8 is a horizontal section taken approxiof Fig. '7.

Like reference characters refer to like parts in the several figures of the drawings.

The machine as disclosed in Fig. 1 comprises a traction support A on which the frame B is mounted, this frame carrying thereon the mixing drum C which is adapted to be charged by the charging skip D and the mixing water supply tank E. The drum C is arranged to discharge into the distributing bucket F supported by the carriage G. The carriage is mounted on rollers in the customary manner and arranged to be moved along the boom H to distribute concrete on the subgrade as shown in dotted lines in this figure of the drawings.

The frame B also carries a power discharge mechanism I for turning the discharge chute to mixing and discharging positions respectively. The power discharge unit is also provided with means for actuating the skip hoist lever K to throw in the skip hoist clutch L to cause raising and charging action of the skip D. The skip D in its charging action is provided with means to actuate the setting rod M for setting the batchmeter N to control the length of the mixing period of the aggregates within the drum.

The batchmeter N is of the usual type and is provided with the trip lever O for tripping the power discharge I into operation, there being a connection or rod P between the lever O and the power discharge chute operating mechanism.

The engine (not shown) for supplying power to the mechanism is housed by the casing Q and through suitable gearing provides power to rotate the skip hoist drum L to cause winding action of the cables D for raising and lowering the skip D. The skip D is provided with a projection D" which is arranged to engage the trifingered lever E to throw the three-way valve E" of the water measuring tank E to tank filling or drum charging position, depending upon whether the skip is being raised or lowered.

The bucket F and the carriage G are moved along the boom by means of the cable H which is suitably wound for this purpose on the drum H". The boom H, as disclosed in Figs. 2 and 3, is pivotally secured to the frame B at R for horizontal swinging movements, the adjustment of which is accomplished through the Worm and gear segment R. The power discharge mechanism I is also provided with a supplemental trip mechanism adapted to be actuated incident to raising or charging action of the skip. This mechanism includes an actuating connection S which trips the discharge chute operating mechanism to throw the discharge chute to mixing position as the charging skip is being raised to charge the mixing drum.

Now referring to Fig. 2 of the drawings, it will be observed that the power discharge chute operating mechanism I, hereinafter referred to as the power discharge, is provided with three levers. The first lever is indicated by the reference numeral l and is connected to the rod P extending to the trip lever O on the batchmeter. The lever i when it is raised by the batchmeter at the end of the mixing period trips the power discharge, causing the discharge chute 2 to be moved from mixing position to discharging position. The second lever referred to on the power discharge and indicated at 3 is the trip lever for tripping the power discharge to cause the discharge chute to move from discharging to mixing position only. This lever is actuated incident to the raising action of the skip and connected to the skip actuating connection S by the bell crank S and link S". The third lever 4 referred to on the power discharge is arranged for manual operation only. In other words, this is a pedal capable of depression by the operator to swing the discharge chute 2 to mixing or discharging position, as the case may be, provided, of course, that the batchmeter is not in set position. When the batchmeter has been set incident to charging action of the mixing drum, this lever 4 is locked against manual actuation, and since under these conditions, the discharge chute is turned to mixing position, any subsequent charging action of the charging skip which causes actuation of the lever 3 will not turn the discharge chute back to discharging position again.

The internal mechanism of the power discharge chute for causing these functions is disclosed in Figs. 7 and 8 of the drawings and will be later described.

The power discharge casing I has extending therefrom a slidable actuating rod 5 which is arranged to throw the skip hoist lever K to skip raising position when the internal mechanism of the power discharge, as will be later explained, moves this rod 5 outwardly away from the casing. The movement of this rod, as just described, occurs when the power discharge moves the discharge chute from mixing to discharging position.

When the batchmeter N is set incident to movement of the rod M, the lever O is moved downwardly to the position shown in full lines in the drawings and with the bucket carriage G in the position as shown in the drawings, the roller 6 on the carriage will support the arm 1 which is pivotally carried by the bearings 8 on the boom H. This arm I, as shown, terminates in a circular portion 9 extending around the vertical axis of rotation R of the boom H and is adapted as shown in full lines in the drawings to support the release lever I 0 connected by the link II to the latch l2. When the lever I 0 is supported in the position as shown, the latch I 2 is moved out of the path of the arm 0 so that at the end of the mixing period, the arm just mentioned is free to move upwardly and'thus rock the lever l on the power discharge to trip the same and cause the discharge chute to be moved from mixing to discharging position.

However, should the distributing bucket be out on the boom away from the receiving position, as shown, when the mixing period ends and the batchmeter trips oiT, then under these conditions, the arm Twill not be supported and will drop down to the position shown in dotted lines in Fig. 2, thus moving away from its supporting relation with respect to the release lever Ill, permitting the spring l3 to rock the lever Ill downwardly, causing the link I l to be moved upwardly, which in turn rocks the latch 12 into locking relation with respect to the shoulder 14 on the lever O of the batchmeter. Under these conditions it will be observed that the lever O is locked against actuation and at the end of the mixing period cannot move upwardly to trip the power discharge mechanism until the carriage is returned to the position substantially as shown in Fig. 2. This return will, of course, rock the latch l2 out of the path of the projection l4, permitting the internal mechanism of the batchmeter to move the lever O upwardly, thus tripping the power discharge and cause the discharge chute to be moved to its discharging position.

The concentric arrangement of the circular portion 9 of the arm 1 with respect to the pivotal center of the boom H is such that proper cooperation between the arm and the lever H3 is accomplished for all angular positions of the boom, this construction being shown more clearly in Fig. 3 of the drawings. Since the batchmeter, when it is in its set or controlling position, maintains the lever l in its lowered position which prevents manual operation of the lever 4, it will be observed that while the bucket is out on the boom, manual operation, as well as automatic operation, of the power discharge and the discharge chute will be prevented. It should also be observed that, since the raising of the lever l which causes tripping of the power discharge and subsequent outward movement of the rod 5 to throw in the skip hoist clutch is prevented by the latch l2, the bucket also controls the operation of the charging skip since the power discharge is so constructed, as will later be described, that upon movement of the discharge chute from non-discharging to discharging position, the rod 5 will be moved outwardly, throwing the skip hoist clutch into clutching relation with the skip hoist mechanism.

Figs. 4 and 5 of the drawings show a slightly modified form in which the discharge chute is not only prevented from moving to discharging position when the bucket is out on the boom away from its receiving position, but in this form the movement of the bucket away from its receiving position actually trips the power discharge to move the discharge chute back to mixing position again.

The rod So in this form functions similarly to the rod S in the preferred form, except that instead of positively engaging the bell crank S the bell crank Sb in this form is provided with an aperture Sd through which the rod Sa passes. The rod Sa being provided with a shoulder or abutment Se, upon raising action of the skip, as shown in Fig. 1 of the drawings, this abutment will engage the bell crank Sb and through its connection So to the lever 3, the lever 3 will be raised, thus tripping the power discharge and turning the discharge chute from discharging to non-discharging position. cranksb and the lever 3 are free to be independently actuated by the lever lfla, as will presently be described.

The power discharge trip lever l is connected to the batchmeter latch lever O by a rigid connection IS in the form of two joined rods [5a and 55b. The section l5b is provided with a latching abutment it which moves downwardly as the batchmeter is set and is adapted to be held in this downward position, under some circumstances, by the latch lever IT. The latch lever I! is pivoted at 8 to the frame B and is provided with an arm l9 to which is attached the link 29. The other end of this link is pivoted to the arm 2| of the trip lever assembly um. The latch lever I7 is provided with a second arm 22 pivotally carrying the bearing 23 in which is slidably mounted the rod 24 which is pivoted at one end to the lever 3 of the power discharge. The other end of the rod 24 is provided with an actuating abutment 24a so that rocking of the latch lever I"! to the right will cause lifting action of the rod 24 and rocking of the trip lever 3 on the power discharge.

The arm la and the circular portion 9a are substantially the same in this form of the invention as in the previously described form, with the exception that the arm la is formed to provide a slight shoulder lb which is arranged to temporarily engage the roller 6a upon outward movement of the carriage G. The roller 6a in this form is carried on a lever 25 pivoted to the carriage G at 26 and arranged to move between the two abutments 21 and 28. A spring 253 is also provided to normally hold the lever 25 in the position as shown in Fig. 4 of the drawings which, it will be observed, supports the arm la in the proper position to hold the latch I! out of engagement with the abutment I6. When the carriage is out on the boom away from its receiving position, the lever la will, of course, be unsupported and will drop down, thus permitting the lever Illa to rock the latch ll into engaging position with respect to the abutment I6 on the rod i519, as shown in detail in Fig. 6 of the drawings. Of course, it must be remembered that the abutment I6 is in the position shown in Fig. 4 of the drawings when the batchmeter is in its released position and as the batchmeter is set incident to charging action of the skip, the abutment l6 moves to the position shown in Fig. 5 of the drawings whereit may be engaged by the latch I1.

Assuming that the discharge chute is in the position shown in Fig. 4 of the drawings and the operator moves the carriage away from the inner end of the boom, then under these conditions, the abutment lb on the lever la will engage the roller 6a on the lever 25. This engagement will rock the lever 25 to the right, as shown in Fig. 5 of the drawings, until it engages the stop 21. This rocking of the lever 25 causes a supplemental raising action of the arm la and the circular portion 91) will rock the release lever liia to the position as shown in this figure of the drawin s, the connection 24 being lifted under these conditions suhiciently to rock the lever 3 to its tripping position which sets the power discharge into action and turns the discharge chute to mixing position. As soon as the carriage moves away However, this bell from the end of the boom and the lever 25 thereon is released, the spring 29 will cause the lever to be swung to the left, as shown in Fig. 4, so that upon return movement of the carriage the lever or arm l'a will not be lifted sufiiciently to trip the power discharge, altho it will be elevated to a point where the latch I! will be moved to disengaging position with respect to the shoulder l6 so that when the batchmeter raises the rod l5 at the end of the mixing period, the power discharge will move the discharge chute to its discharging position.

The internal mechanism of the power discharge I is disclosed in Figs. 7 and 8 of the drawings and will now briefly be referred to. The constantly rotating shaft 30 is provided with a clutch 3i which is adapted to be engaged by the rocking of a clutch shifter 32 pivoted at 33. This clutch shifter is normally held to the left, as shown in Fig. 7 by a bar 34. The bar 34 is normally held in position by the release bell crank 35. The arm I is secured to a sleeve 36 which carries a lever 31 having depending therefrom the release or knock-out bar 38 provided with a toe 39. When the bar 38 is in the position as shown in this figure, the toe 39 extends under the release bell crank 35 and prevents the same from being actuated. At the end of the mixing period, the batchmeter raises the rod P or !5b, as the case may be, thus lowering the knock-out bar 38 which engages and rocks the release bell crank 35, which in turn permits the spring 39 to force the clutch elements into engagement and set the power discharge into action. The power discharge is so arranged that the crank 40 which actuates the discharge chute will be moved through an arc of whereupon the clutch 34 will be again disengaged and the parts come to a state of rest. The sleeve 36 carrying the arm 31 is freely carried on a shaft 4| to which the arm 42 is secured. This arm 42 carries the knockout bar 43 but is not provided with a toe similar to the part 39 of the lever 38. The lever 3 is secured to the other end of the shaft 4| so that movement of the lever 3 either by the charging action of the charging skip or by the abnormal movement of the latching lever Illa, as seen in Fig. 5 of the drawings, this knock-out bar 43 will be lowered.

It should here be observed that the crank 40 which is carried by the shaft 44 to which the driving gear 45 is secured cannot be turned from mixing to discharging position due to a lowering of the knock-out bar 43. The reason for this is that the gear 45 is provided with a cam 46 which moves under the crooked lever 47, rocking the same to the right when the discharge chute turns to mixing position. The rocking of this lever 41 to the right moves the forked actuator 48 which is located directly behind the knock-out bar 43 so that this knock-out bar will be swung out of engaging position with respect to the release bell crank 35. This cam 46 also constitutes the actuating element for the rod 5 and when the discharge chute moves from mixing to discharging position, the cam 46 moves under the roller 5a, thus moving the rod 5 to the right and throwing in the skip hoist clutch as before mentioned.

The pedal 4 of the power discharge is secured to the shaft 49 to which a lever 59 is fixed carrying a knock-out bar 5! similar to the knock-out bar 43, and depression of the foot pedal 4 will turn the discharge chute under these conditions to discharging or mixing position, as the case may be, provided, of course, that the toe 39 of the lever 38 is not in supporting engagement with the release bell crank 35. In order to prevent the batchmeter from actually tripping the power discharge at the end of the mixing period, a manually operable lever 52 is provided which is secured to the shaft 53, this shaft in turn being provided with a cam 54 which may be rotated incident to actuating of the lever 52 so that the knock-out bar 38 will be moved to a position where it will not engage the release bell crank 35 when the lever l is raised. Even under these conditions, it should be observed that the toe 39 will still be positioned under the release bell crank when the power discharge is under the control of the batchmeter.

While the specific details of construction have been herein shown and described, the invention is not confined thereto as changes and alterations may be made without departing from the spirit thereof as defined by the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patcut is:

1. In a concrete paving machine, a support, a mixing drum, discharging means therefor, a boom carried by the support, a distributing element movably carried by the boom to and from receiving position with respect to the discharging means, a batchmeter for controlling the discharging action of the discharging means, and supplemental control means for the discharging means operable to prevent discharging action thereof and arranged to be shifted to inoperative position incident to the return of the bucket to receiving position to permit discharging action of the discharging means as controlled by the batchmeter.

2. In a concrete paving machine, a support, a mixing drum, charging means for charging the drum with aggregates to be mixed therein, a discharge chute for emptying the drum of its mixed aggregates, abatchmeter for indicating the mixing period of the aggregates within the drum and arranged to be set by the charging means, a distributing device movable to and from concrete receiving position with respect to the discharge chute, control device for the batchmeter to prevent the same from indicating the termination of the mixing period and means operable by movement of said distributing device for rendering said batchmeter control device inoperative when said distributing device is in concrete receiving position.

3. In a concrete paving machine, a support, mixing means, charging means therefor, discharging means therefor, a boom, a distributing element arranged to receive the mixed material from the discharging means and movable along the boom to distribute the material, a power operated mechanism for turning the discharging means to discharging and non-discharging positions, a batchmeter for setting the power operated mechanism into operation, and batchmeter control means operable by the distributing means incident to movement thereof along the boom to control the operation of the batchmeter.

4. In a concrete paving machine of the class described, in combination, a mixer, charging means therefor, discharging means therefor, a distributing element for said discharging means, means for compelling synchronizing of the actions of the charging and discharging means, a manually operable instrumentality to interfere with the action of the compelling means, and control means gases for controlling theoperat'ion ofthe compelling means and operable by the distributing element.

5. In a concrete paving machine, in combination,-mixing means, charging means for feeding 5 concrete aggregates to the mixing means, means whereby discharge of the mixing means may be eifective, means for causing automatic operations of the charging and discharging means, a distributing element arranged to receive the mixed conlO crete from the discharging means and distribute the same, and control means for controlling operation of the automatic means operable bythe distributing means.

6. In a concrete paving machine, a support, a mixing element carried thereby, a discharge chute movable to mixing and discharging positions, a power discharge for shifting the chuteto said positions, a boom carried by the support, a distributing element positioned to receive the mixed concrete discharged. from the discharge chute and movable along the boom to distribute the same, a batchmeter for setting the power discharge chute into operation, latch means associated with the batchmeter and the distributing element for controlling'the operation of the batchmeter, said latch means being rendered inoperative by the distributing element ,when the distributing elementis' moved to receiving position with respect to the discharge chute.

7. In a concrete paving machine, a support, mixing means, charging means therefor, discharging means therefor, distributing means for receiving mixed concrete from the discharging means and movable away from said discharging means to distribute the same, a power discharge mechanism for operating the discharging means, means for causing charging action of the charging means, means operable from the charging means for moving the discharging means to non-discharging 40 position, and means operable by the distributing element for moving the discharging means to nondischarging position when the distributing element is moved away from the discharging means. v 45 8. In a concrete paving machine, a support,

mixing means, charging means for the mixing means, discharging means for the mixing means,

a power discharge for moving the discharging means to discharging and non-discharging posi- 5 tions, a boom carried by said support, distributing means associated with the discharging means to receive the mixed concrete discharged thereby from the mixing means, the said distributing means being movable along the boom to distribute the same, a batchmeter for tripping the power discharge to move the discharging means to discharging position, means operable by the charging means for setting the batchmeter, means operable by the distributing means incident to movement (3,!) away from its receiving position to trip the power discharge to move the discharging means to nondischarging position, and latch means arranged to normally prevent operation of the batchmeter when set by the charging means, said latch means being arranged to be rendered inoperative by the distributing means when the distributing means is in receiving position with respect to the discharging means.

9. In a concrete paving machine, a mixer, charging means therefor, discharging means therefor, means operable from the charging means to subsequently actuate the discharging means, means normally preventing subsequent actuation of the discharging means, a distribut- 75 ing element arranged to receive mixed concrete Lil from the discharging means and movableaway from the discharging means to distribute the same, said distributing element being associated with the means for preventing subsequent operation of the discharging means when the distributing element is in receiving position with respect to the discharging means so as to render said preventing means inoperative, and means operable by the distributing element incident to movement away fromthe receiving position aforemene tioned totrip the power discharge and move the discharge chute to non-discharging position.

10. In a concrete mixin'gmachine, asupport, a mixing device carried thereby,charging means therefor, discharging means therefor, batchmeter means for controlling the operation of the charging and discharging means, boom means on said support, concrete distributing means movable on said boom means, supplemental means controlling the operation of said batchmeter means, and means operable by the distributing means for controlling the effective operation of said supplemental means. i

11. In a concrete paving machine ofthe class described, a support, a mixing drum, carried thereby, discharging means therefor, distributing 1 means for receiving material from said dioharging means and movable to distribute the same, controlling means for controlling the discharging action of the discharging means, and operating means operatively connected with said controlling means and said distributing means to render said controlling means inoperative only when said distributing means is in receiving position with respect to said discharge means.

12. In a concrete paving machine, a support, a mixing drum carried thereby, charging means for charging the drum, discharging means for emptying the drum, a boom, a distributing element movable along said boom from a receiving position with respect to said discharging means, power operated means for initiating the charging action of the charging means and the discharging action of'the discharging means, controlling means to prevent the initiating operation aforesaid, and means operable by said distributing element to render said controlling means inoperative when said distributing means is in receiving position.

13. The combination with a concrete mixing apparatus, means for directing concrete discharged from said mixing apparatus and movable to and from directing position, of means for moving said directing means to and from a concrete discharging position, distributing means for receiving concrete discharged past said directing means, means interposed between the distributing means and the means for actuating the concrete directing means for controlling such actuation and means operated by movement of the concrete distributing means for operatively actuating said control means.

14. In a concrete paving machine, a support, mixing means, charging means for charging ag gregates to be mixed into the mixing means, discharging means for emptying the mixing means, a batchmeter for indicating the mixing period of the aggregates within the mixing means, means for setting the batchmeter from the charging means, a boom carried by the support, a distributing device movable along the boom from receiving position with respect to the discharging means to another position on the boom, batchmeter operation prevention means to prevent operation of said batchmeter, and means operable by said distributing means for rendering said last named batchmeter operation prevention means inoperative only when said distributing means is in concrete receiving position with respect to the discharging means.

15. In a mixing machine, in combination, a mixing drum, charging means therefor, discharging means therefor, operating means for causing simultaneous operation of said charging and discharging means, a movable distributing element for said discharging means for actuating said operating means, and means coacting with said distributing element and operating means aforesaid to control the operation thereof incident to movement of said distributing element with respect to said discharging means.

16. In a concrete paving machine of the class described, a support, mixing means on said support, charging means for charging said mixing means, discharging means for said mixing means movable to discharging and non-discharging positions, distributing means for receiving mixed concrete from said discharging means, and movable away from said discharging means to distribute the same, control means operable by said distributing means upon movement thereof away from said discharging means for moving said discharging means to. non-discharging position.

17. The combination of a concrete mixer, concrete discharge means therefor, a concrete distributor relatively movable with respect to said discharge means, said discharge means being movable to discharging and non-discharging positions and when in discharging position to receive concrete from said mixer and deliver it to said distributor, and control means for controlling the discharging operation of said discharge means and operable by said distributing means upon movement of said distributor means with respect to said discharge means to control the discharging action of said discharge means.

18. In a concrete paving machine, a mixing device, means whereby to discharge said device, means for charging the device with aggregates to be mixed therein, a distributing element arranged to receive the mixed concrete when discharged from the discharging means and movable to distribute the same, a controlling batchmeter, a power discharge mechanism for controlling the synchronizing of the operation of the last two means to overlap their operation periods, said mechanism being under said batchmeters control, and control means for controlling the operation of the batchmeter operable by the distributing element.

CHARLES H. WAGNER. 

